Schwerer Gustav - The Greatest, And Most Useless Gun Ever Put Into Combat - Military-wiki

Gustav fired a total of 48 shells at Sevastopol, most of which were aimed at Soviet fortresses. Berlin threw away more 1,000 tons of steel for 48 shots.

P.1000 Ratte - Paper Tiger or Nazi Super Tank

Assault gun - Wikipedia

Why It failed?:The Schwerer Gustav, Johnny OTGS World Wikia

Schwerer Gustav: Largest Gun Mankind Has Ever Built

Was the Gustav gun successful, and was it destroyed? If it was, how? - Quora

warfare - What kind of war would lead to Ultra-Heavy tanks being useful? - Worldbuilding Stack Exchange

Could a Nazi Super Gun change the tide of war in Soviet and quickly destroy UK to avoid entry of US in WW2 which led to two front wars? - Quora

Landkreuzer P. 1500 Monster, this machine is essentially the P 1000 rattes big brother Crew: 100+, Armor: 250 millimetres (9.8 in) (hull front) 200 millimetres (7.9 in) (hull sides) (800mm gun variant)

Jacob Rosenfeld, The Wolfenstein Fanon Wiki

Why the Biggest Gun built was Useless

Schwerer Gustav: Largest Gun Mankind Has Ever Built

United States WW2 Era Rail Gun : r/HumanForScale